Red Seal Electrician Practice
DC circuitsQuestion 837 of 1506

A copper winding heats up from 20 °C to 60 °C. What happens to its resistance?

  1. It decreases a little.
  2. It stays exactly the same.
  3. It increases.
  4. It drops to zero.
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Correct answer: It increases.

Pure metals have a positive temperature coefficient, so their resistance rises with temperature.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.6: Temperature Coefficient of Resistance

Practice dc circuits

Questions last reviewed: 18 October 2026